/*
 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package org.graalvm.compiler.truffle.common;

import org.graalvm.compiler.debug.GraalError;

/**
 * Initializes and stores the singleton {@link TruffleCompilerRuntime} instance.
 */
final class TruffleCompilerRuntimeInstance {
    /**
     * The singleton instance.
     */
    static final TruffleCompilerRuntime INSTANCE = init();

    private static TruffleCompilerRuntime init() {
        Object truffleRuntime = TruffleRuntimeInstance.INSTANCE;
        if (truffleRuntime instanceof TruffleCompilerRuntime) {
            return (TruffleCompilerRuntime) truffleRuntime;
        }
        throw new GraalError("Truffle runtime %s (loader: %s) is not a %s (loader: %s)", truffleRuntime, truffleRuntime.getClass().getClassLoader(),
                        TruffleCompilerRuntime.class.getName(), TruffleCompilerRuntime.class.getClassLoader());
    }
}
